JP2018026912A - Power management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power management system capable of implementing reduction in power consumption even when temporary reduction in the power consumption is required suddenly.SOLUTION: A first acquisition unit acquires power consumption information showing a power consumption amount in a user facility. A second acquisition unit acquires a power saving request for requesting reduction in power consumption in a designated period Td1, from an external device installed outside the user facility via communication. A demand control unit performs demand control of controlling an apparatus in the user facility on the basis of the power consumption information acquired by the first acquisition unit so that a power consumption amount in a predetermined demand time interval T1 does not exceed a demand target value Vp. A change unit, on the basis of the power saving request acquired by the second acquisition unit, changes the demand target value Vp so as to decrease the demand target value Vp in the designated period Td1.SELECTED DRAWING: Figure 1

Description

  The present invention generally relates to a power management system, and more particularly to a power management system that manages the amount of power used by a customer facility.

  Conventionally, a power management apparatus for executing demand control for power consumption by a device (load device) has been proposed (see, for example, Patent Document 1).

  The power management apparatus described in Patent Literature 1 includes target value acquisition means for acquiring a demand target value of power consumption (power consumption) by a device, and storage means for storing calendar information about the user. Yes. Furthermore, the power management apparatus described in Patent Literature 1 includes a setting unit that adjusts and sets a demand target value based on calendar information. When the calendar information predicts that power consumption is low in the user's home, the demand target value is adjusted so as to lower the upper limit of power consumption.

JP 2013-252007 A

  However, in the power management apparatus described in Patent Document 1, since the demand target value is adjusted based on the calendar information about the user stored in the storage unit, the calendar unit does not store the calendar information in advance. The demand target value is not adjusted. Therefore, for example, when a temporary reduction in power consumption is urgently requested by an electric power company due to a tight power supply and demand, there is a possibility that the power consumption reduction cannot be realized.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a power management system capable of realizing reduction of power consumption even when temporary reduction of power consumption is urgently required.

  A power management system according to an aspect of the present invention includes a first acquisition unit, a second acquisition unit, a demand control unit, and a change unit. The first acquisition unit acquires power usage information representing the power usage of the customer facility. The second acquisition unit acquires a power saving request for requesting reduction of power consumption in a specified period by communication from an external device provided outside the customer facility. The demand control unit controls the equipment of the customer facility based on the power usage information acquired by the first acquisition unit so that the power usage amount in a predetermined demand time limit does not exceed a demand target value. Perform demand control. The changing unit changes the demand target value so as to decrease the demand target value during the designated period based on the power saving request acquired by the second acquisition unit.

  The present invention has an advantage that it is possible to reduce the power consumption even when a temporary reduction in the power consumption is urgently required.

FIG. 1 is a graph showing the operation of the power management system according to the first embodiment of the present invention. FIG. 2 is a system configuration diagram showing the configuration of the above power management system. FIG. 3 is a block diagram showing a configuration of the above power management system. FIG. 4 is a graph showing the operation of the power management system according to the second embodiment of the present invention.

(Embodiment 1)
(1) Overview The power management system 1 (see FIG. 2) according to the present embodiment is a system for managing the amount of power used in the customer facility 100 (see FIG. 2). The “customer facility” here refers to a facility that is managed and used by a consumer of electric power. In this embodiment, a non-residential facility such as an office building, a commercial facility, a hospital, a welfare facility, a hotel, or a factory will be described as an example of the customer facility 100. The customer facility 100 is, for example, a collective housing or a detached house. It may be a house.

  The power management system 1 has a demand control function for suppressing an increase in the maximum demand power of the customer facility 100 as a main function. The “maximum demand power” here is also called a power receiving point demand power or a demand value, and is an average power used (average of power used) in a predetermined time period T1 (see FIG. 1) (for example, every 30 minutes). Value) is the maximum value in each month (for one month). The maximum value of the maximum demand power in the past year is called “contract power”. Based on this contract power, the customer (the manager of the customer facility 100 or the user) is a power company or the like. There is a system that determines the electricity charges to be paid to electric utilities. Under such a system, the suppression of the maximum power demand of the customer facility 100 by the power management system 1 leads to the suppression of the electricity bill. In short, the power management system 1 suppresses an increase in average power consumption at the demand time limit T1 in the customer facility 100 by the demand control function, and suppresses the “maximum demand power” below the current contract power, The rise can be suppressed. The suppression of the increase in average power consumption is basically realized by controlling the equipment 5 (see FIG. 2) of the customer facility 100.

  Here, the maximum demand power is the maximum value for one month of the average power consumption in the demand time period T1, but the average power consumption in the demand time period T1 is the amount of power used in the demand time period T1 (time integral value of power usage). Expressed by multiplying by a constant (predetermined coefficient). For example, when the demand time limit T1 is 30 minutes, the power consumption amount of the demand time limit T1 is doubled by x [kWh], so that 2x [kWh], which is the power consumption amount for one hour, is obtained. The average power consumption in the demand time period T1 at this time is a value obtained by multiplying the power consumption amount in the demand time period T1 by a constant (in this case, “2”), that is, 2 × [W]. Therefore, in demand control, suppressing the amount of power used in the demand time period T1 below a certain target value (demand target value) means that the average power used in the demand time period T1 is twice the power target value (demand target value). It is equivalent to the following suppression. Therefore, the power management system 1 according to the present embodiment controls the equipment 5 of the customer facility 100 as demand control so that the amount of power used in the demand time limit T1 does not exceed the demand target value Vp (see FIG. 1). Thus, an increase in average power consumption during the demand time period T1 is suppressed.

  Furthermore, the power management system 1 according to the present embodiment reduces the power used by the customer facility 100 in the designated period Td1 in response to a power saving request for requesting reduction of the used power in the designated period Td1 (see FIG. 1). It has a response (Demand Response) function. The “power saving request” here is also called a DR (Demand Response) request. For example, when the power supply and demand is tight or the wholesale power price rises, the electric power company such as an electric power company becomes the sender, This is an instruction for requesting a reduction in power consumption from a consumer. The reduction in power consumption of the customer facility 100 is basically realized by controlling the equipment 5 (see FIG. 2) of the customer facility 100. That is, the power management system 1 can achieve a reduction in power consumption even when a temporary reduction in power consumption is urgently requested by the demand response function.

  As described above, the power management system 1 reduces the power used by the customer facility 100 in the specified period Td1 according to the demand control function for suppressing the increase in the maximum demand power of the customer facility 100 and the power saving request. Demand response function. The power management system 1 according to this embodiment does not have these two types of functions (demand control function and demand response function) individually, but performs them together in one routine (Routine). Specifically, the power management system 1 implements the demand response function in the process related to the demand control function by changing the demand target value Vp during the designated period Td1 based on the power saving request. In other words, the power management system 1 changes the parameter (demand target value Vp) used in the demand control function for controlling the device 5 so that the power consumption does not exceed the demand target value Vp, so that the power management system 1 in the specified period Td1. Reduction of power consumption can be realized. Therefore, in the power management system 1, by using the demand control function for suppressing the increase in the maximum demand power of the customer facility 100, the power used by the customer facility 100 in the designated period Td1 can be efficiently and easily determined. Demand response function can be realized for reduction.

  In the present embodiment, as an example, a model in which an electric power aggregator is interposed between an electric power company such as an electric power company and a customer (an administrator or a user of the customer facility 100) and electric power is traded is used. Suppose. The power aggregator is an operator that manages a plurality of consumers, and obtains an incentive by performing a negawatt (Negawatt Power) transaction with the electric utility. More specifically, when a power aggregator receives a power saving request, which is a request to reduce power consumption, from an electric power provider, it reduces the power consumption at the customer facility 100 for each of a plurality of consumers managed by the power aggregator. Give instructions to help. When the power consumption is reduced at the plurality of customer facilities 100 according to this instruction, the power aggregator receives compensation from the electric power company according to the results of the reduction of the power usage at the plurality of customer facilities 100. obtain. In the present embodiment, the customer facility 100 is supplied with power only from the power system, and a case where a distributed power source such as a solar power generation facility is not provided in the customer facility 100 is illustrated.

(2) Configuration Hereinafter, the configuration of the power management system 1 according to the present embodiment will be described in detail with reference to FIG.

  As shown in FIG. 2, the power management system 1 according to the present embodiment includes a controller 2 and a server device 3. The controller 2 is provided in the customer facility 100. The controller 2 is connected to the measurement system 4 and a plurality of devices 51, 52, 53,.

  Each of the plurality of devices 5 is an electrical device (including equipment) such as a lighting device and an air conditioner provided in the customer facility 100 and is an electrical device to be controlled by the controller 2. Hereinafter, when the plurality of devices 51, 52, 53,... 5n are not particularly distinguished, each of the plurality of devices 51, 52, 53,.

  The measurement system 4 is configured to be able to measure at least the power consumption of the customer facility 100. Here, “the amount of power used by the customer facility 100” is the total amount of power used (consumed) at the customer facility 100, and is the total amount of power supplied from the power system to the customer facility 100. . That is, the measurement system 4 measures the total amount of power used by all the electric devices in the customer facility 100 as the amount of power used. Here, the electrical device that is the measurement target of the power consumption in the measurement system 4 may include an electrical device other than the device 5 that is the control target of the controller 2.

  The measurement system 4 includes, for example, a watt hour meter attached to the cubicle 61 of the consumer facility 100 and a measurement unit attached to the distribution board 62 of the consumer facility 100. Thereby, the measurement system 4 can measure the amount of power used by the customer facility 100 with at least the watt-hour meter attached to the cubicle 61. In addition, the measurement system 4 can also measure the amount of power used for each branch circuit with a measurement unit attached to the distribution board 62. The measurement system 4 outputs information indicating the power consumption of the customer facility 100 and the power consumption of each branch circuit to the controller 2 as power usage information. Further, an alarm device 7 is connected to the measurement system 4. For example, when the amount of power used is likely to exceed the demand target value Vp, the measurement system 4 causes the alarm device 7 to output an alarm sound.

  The controller 2 is configured to be able to communicate with, for example, the measurement system 4 and the plurality of devices 51, 52, 53,. The controller 2 has a function of acquiring power usage information from the measurement system 4. Further, the controller 2 has a function of controlling a plurality of devices 51, 52, 53,... 5n, and controlling the plurality of devices 51, 52, 53,. For example, the controller 2 controls the on / off state of the device 5 and the operation state of the device 5 by transmitting a control command to the device 5. For example, the controller 2 can perform dimming control for adjusting the brightness of the device 51 including the lighting device, and can control the temperature setting value, the air volume, and the like for the device 52 of the air conditioning device. is there.

  The communication method between the controller 2 and each of the measurement system 4 and the device 5 is, for example, wired communication such as RS232C, RS485, or Wi-Fi (registered trademark) or low-power wireless that does not require a license (specific small Wireless communication such as (electric power wireless). For this type of low-power radio, specifications such as the frequency band to be used and the antenna power are defined in each country depending on the application. In Japan, low-power radio that uses radio waves in the 920 MHz band or 420 MHz band is defined.

  The controller 2 is connected to a network 81 such as the Internet via a router 82. The server device 3 is connected to the network 81. The controller 2 is configured to be capable of bidirectional communication with the server device 3 via the network 81. The controller 2 will be described in detail in the section “(3) Details”.

  The server device 3 constitutes the power management system 1 together with the controller 2. In the present embodiment, the server device 3 is a computer managed and operated by a power aggregator as an example. That is, in FIG. 2, only one server device 3 and one controller 2 are illustrated, but actually, a plurality of customer facilities (customer's) managed by the power aggregator for one server device 3. A plurality of controllers 2 provided in the facility 100) are connected to be communicable. Furthermore, an external device 9 provided outside the customer facility 100 is connected to the network 81. The server device 3 is configured to be capable of bidirectional communication with the external device 9 via the network 81.

  The external device 9 is a computer managed and operated by an electric power company such as an electric power company. As will be described in detail later, the external device 9 transmits to the server device 3 a power saving request for requesting reduction of power consumption in the designated period Td1. For example, when the power supply and demand is tight, the external device 9 becomes a transmission source, and a power saving request is transmitted to the server device 3.

  Note that an information terminal such as a smartphone, a tablet terminal, or a personal computer may be connected to the network 81, for example. In this case, the controller 2 preferably transmits, for example, power usage information acquired from the measurement system 4 and information indicating the control status of the device 5 to the information terminal via the server device 3. Thereby, regardless of the inside or outside of the customer facility 100, information (power usage information or the like) regarding the customer facility 100 can be displayed and visualized on the information terminal.

(3) Details Next, details of the power management system 1 according to the present embodiment will be described with reference to FIG.

  The power management system 1 includes a first acquisition unit 11, a second acquisition unit 12, a control unit 13, and a storage unit 14. In the present embodiment, among the components of the power management system 1 shown in FIG. 3, only the second acquisition unit 12 is provided in the server device 3, and all the components other than the second acquisition unit 12 are provided in the controller 2. Yes. Therefore, the exchange of information between the second acquisition unit 12 and the control unit 13 is realized by communication between the server device 3 and the controller 2.

  The first acquisition unit 11 acquires power usage information indicating the power usage of the customer facility 100. Specifically, the first acquisition unit 11 acquires power usage information from the measurement system 4 by communicating with the measurement system 4.

  The second acquisition unit 12 acquires, through communication, an external device 9 provided outside the customer facility 100 to request a power saving request for reducing power consumption in the specified period Td1. That is, the second acquisition unit 12 acquires a power saving request from the external device 9 by communicating with the external device 9.

  The control unit 13 includes a demand control unit 131, an energy saving control unit 132, a change unit 133, and a return unit 134. The control unit 13 includes a microcomputer as a main component, and the microcomputer functions as a demand control unit 131, an energy saving control unit 132, a change unit 133, and a return unit 134.

  The demand control unit 131 is based on the power usage information acquired by the first acquisition unit 11 so that the power usage amount in the predetermined demand time period T1 (see FIG. 1) does not exceed the demand target value Vp (see FIG. 1). The demand control for controlling the equipment 5 of the customer facility 100 is performed. That is, the demand control part 131 implement | achieves the demand control function for suppressing the increase in the maximum demand electric power of the consumer facility 100, as demonstrated in the column of "(1) Summary". Here, when a predetermined period (for example, one day) is divided into a plurality of time periods each having a predetermined time width (for example, 30 minutes), each of the plurality of divided time periods is the demand time period T1. is there. Specifically, the demand control unit 131 controls the device 5 so that the power consumption of the customer facility 100 at the end of the demand time period T1 falls within the demand target value Vp for each demand time period T1. Since the determination as to whether the power consumption of the customer facility 100 falls below the demand target value Vp is made for each demand time period T1, the power consumption of the customer facility 100 used for this determination is the demand time limit T1. Reset to zero at the start of.

  As an example of demand control, there is control for lowering the dimming level (brightness) or turning off the light depending on the situation of the device 51 made up of lighting devices. As another example of demand control, there is control for increasing the temperature set value during cooling operation or stopping the device 52 made of air conditioning equipment according to the situation. This type of demand control is performed in a plurality of stages (e.g., 8 stages), and the power consumption of the device 5 can be suppressed each time the stages are followed.

  The energy saving control unit 132 performs energy saving control for suppressing the power consumption of the device 5. Here, the energy saving control unit 132 has a plurality of operation modes including an energy saving mode in which energy saving control is performed and a release mode in which energy saving control is not performed. In this embodiment, there are only two operation modes of the energy saving control unit 132: the energy saving mode and the release mode. That is, if the operation mode of the energy saving control unit 132 is the release mode, the controller 2 does not perform the energy saving control of the device 5, so that the device 5 freely operates according to the user's operation. On the other hand, if the operation mode of the energy saving control unit 132 is the energy saving mode, the controller 2 executes the energy saving control of the device 5, so that the power consumption of the device 5 can be suppressed. The operation mode of the energy saving control unit 132 can be switched by a user operation, for example.

  As an example of the energy saving control, there is a control for automatically adjusting the light control level (brightness) based on the detection result of the illuminance sensor for the device 51 including the lighting device. As another example of the energy saving control, there is control for automatically adjusting the temperature set value, the air volume, etc., based on the detection result of the temperature sensor for the device 52 including the air conditioning device. This type of energy saving control can reduce the power consumption of the device 5 within a range that does not impair user comfort.

  Based on the power saving request acquired by the second acquisition unit 12, the changing unit 133 changes the demand target value Vp so as to decrease the demand target value Vp during the designated period Td1 (see FIG. 1). Here, the changing unit 133 changes the demand target value Vp from the first value V1 (see FIG. 1) to the second value V2 (see FIG. 1) in the designated period Td1 based on the power saving request acquired by the second acquiring unit 12. ). That is, when the designated period Td1 starts, the changing unit 133 changes the demand target value Vp used for demand control in the demand control unit 131 from the first value V1 to the second value V2 (< Change to V1). Specifically, the change unit 133 changes the “demand target value” stored in the storage unit 14 from the first value V1 to the second value V2 when the current time (current time) is the start time of the designated period Td1. And update.

  The return unit 134 returns the demand target value Vp changed by the changing unit 133 to the value before the change after the end of the designated period Td1. Here, the return unit 134 changes the demand target value Vp from the second value V2 to the first value V1 (see FIG. 1) after the designated period Td1 ends based on the power saving request acquired by the second acquisition unit 12. To do. That is, when the designated period Td1 ends, the return unit 134 changes the demand target value Vp used for demand control in the demand control unit 131 from the second value V2 to the first value V1 (> Change to V2). Specifically, when the current time (current time) reaches the end point of the designated period Td1, the return unit 134 changes the “demand target value” stored in the storage unit 14 from the second value V2 to the first value V1. And update.

  Here, the 1st value V1 and the 2nd value V2 are produced | generated in the server apparatus 3 provided with the 2nd acquisition part 12, for example. Specifically, the server device 3 uses, for example, 95% of the contract power as the first value V1 based on the contract power of the customer facility 100 (the maximum value of the maximum demand power of the past year). The first value V1 is calculated so that Further, the server device 3 analyzes the power saving request acquired by the second acquisition unit 12, and calculates the second value V2 from the first value V1 using the analysis result of the power saving request. For example, when it is requested to reduce the used power by 15% in the power saving request, the server device 3 calculates the second value V2 so that 85% of the first value V1 becomes the second value V2. The controller 2 receives the first value V1 and the second value V2 calculated by the server device 3, and sets (changes, returns) the demand target value Vp. Moreover, not only this structure but 1st value V1 and 2nd value V2 may be produced | generated by the controller 2, for example, and may be beforehand memorize | stored in the memory | storage part 14. FIG.

  The storage unit 14 stores “demand target value” and “reservation information”. In FIG. 3, “demand target value” and “reservation information” stored in the storage unit 14 are represented as blocks surrounded by a broken line. The “demand target value” stored in the storage unit 14 is the current demand target value Vp, that is, the demand target value Vp being used for demand control in the demand control unit 131. The “reservation information” stored in the storage unit 14 is information indicating a reservation period including a future designated period Td1 based on the power saving request acquired by the second acquisition unit 12, and a demand target value Vp after the change in the reservation period. It is. Therefore, if reservation information is stored in the storage unit 14 in advance, the change unit 133 and the return unit 134 can change or return the demand target value Vp according to the reservation information.

  Note that each of the controller 2 and the server device 3 included in the power management system 1 has a computer (including a microcomputer) as a main configuration. Therefore, the computer can function as the power management system 1 having the above-described configuration by executing the program recorded in the memory of the computer with the processor of the computer. The program may be recorded in advance in a memory, may be provided through an electric communication line such as the Internet, or may be provided by being recorded in a recording medium such as a memory card.

(4) Operation Next, the operation of the power management system 1 according to the present embodiment will be described with reference to FIG. Hereinafter, each of the basic operation, the operation at the start of the designated period Td1, the operation at the end of the designated period Td1, and the reservation operation will be described. FIG. 1 is a graph showing the power consumption [kWh] of the customer facility 100 with the horizontal axis as the time axis. In the example of FIG. 1, the power consumption [kWh] of the customer facility 100 for 2 hours from 11:30 to 13:30 is shown. As described in the section “(1) Overview”, the average power consumption in the demand time period T1 is a value obtained by multiplying the power consumption amount in the demand time period T1 by a constant. Even if it is read, the same graph as in FIG. 1 is obtained.

  Here, as an example, it is assumed that 1 hour from 12:00 to 13:00 is designated as the designated period Td1 in the power saving request, and it is requested to reduce the power used in the designated period Td1 by 15%. .

(4.1) Basic Operation First, the basic operation of the power management system 1 will be described.

  In the present embodiment, the demand time period T1 is set in units of 30 minutes such as 11:30 to 12:00, 12: 0 to 12:30, 12:30 to 13:00, 13: 0 to 13:30, and so on. Is set. Therefore, in FIG. 1, for example, when attention is paid to the demand time period T1 of 11:30 to 12:00, the amount of power used by the customer facility 100 increases with the passage of time from 11:30, which is the start point of the demand time period T1. Gradually increasing. Here, since the power management system 1 has the demand control function, the demand power value of the customer facility 100 at the end of the demand time period T1 is kept below the demand target value Vp for each demand time period T1. The control unit 131 controls the device 5. In FIG. 1, the demand target value Vp is indicated by a one-dot chain line.

  Specifically, the demand control unit 131 obtains the used power amount of the customer facility 100 at the end time of the demand time period T1 as the predicted power amount based on the used power information acquired by the first acquiring unit 11. Yes. Then, the demand control unit 131 controls (demand control) the device 5 so that the calculated predicted power amount does not exceed the demand target value Vp stored in the storage unit 14. More specifically, the demand control unit 131 obtains a predicted power amount at a predetermined determination period (for example, one minute period) within the demand time period T1, and compares the predicted power amount with the demand target value Vp, thereby calculating the predicted power amount. Is less than or equal to the demand target value Vp. Here, there are various methods for calculating the predicted power amount. As an example, the predicted power amount is calculated using the used power amount from the start time of the demand time period T1 to the present time and the change rate (increase rate) of the used power amount. There is a way to calculate. However, the present invention is not limited to this method, and the demand control unit 131 uses, for example, the detection results of various sensors (illuminance sensor, temperature sensor, etc.) and the past actual values (for example, the same month of the previous year). The predicted power amount may be calculated.

  Then, if the predicted power amount exceeds the demand target value Vp, the demand control unit 131 executes control of the device 5 so as to suppress the power consumption of the device 5, and the predicted power amount is equal to or less than the demand target value Vp. For example, the control of the device 5 is not executed. In FIG. 1, “C 1”, “C 2”, and “C 3” respectively represent the timings at which the first-stage control, the second-stage control, and the third-stage control are performed. That is, in the demand time period T1 from 11:30 to 12:00, the demand control unit 131 determines that the predicted power amount exceeds the demand target value Vp twice at around 11:45 and around 11:52. Each time, the demand control of the device 5 is executed. Note that when the demand control unit 131 determines that the predicted power amount exceeds the demand target value Vp, the demand control unit 131 may cause the alarm device 7 to output an alarm sound.

  Here, since the demand time period T1 of 11:30 to 12:00 does not correspond to the specified period Td1 (12: 0 to 13:00), the demand target value Vp is a default value in the demand time period T1. The first value V1 (> V2) is set. Therefore, in the demand time period T1 of 11:30 to 12:00, the demand control unit 131 causes the power consumption of the customer facility 100 to be equal to or less than the first value V1 that is the demand target value Vp even when the demand time period T1 ends. Can be suppressed. The first value V1, which is the default value of the demand target value Vp, is set on the basis of the contract power (the maximum value among the maximum demand power in the past year). For example, 95% of the contract power is the first value V1. One value V1 is set.

  By the way, the demand control unit 131 excludes the mask period Tm1 from when the demand time period T1 starts until the standby time elapses, and at the end time of the demand time period T1 based on the power usage information acquired by the first acquisition unit 11. Is used as the predicted power consumption. Here, the standby time is shorter than the time width of the demand time period T1, and in the present embodiment, as an example, the time width of the demand time period T1 is 30 minutes, while the standby time is set to 10 minutes. That is, since the power consumption used for calculating the predicted power amount is reset to zero at the start of the demand time period T1, the prediction accuracy of the predicted power amount is insufficient immediately after the start of the demand time period T1, The fluctuation of the predicted electric energy increases. Therefore, the demand control unit 131 does not obtain the predicted power amount during the mask period Tm1 from when the demand time period T1 starts until the standby time elapses, and starts calculating the predicted power amount after the mask period Tm1 has elapsed. Therefore, in the demand time period T1 from 11:30 to 12:00, the demand control unit 131 does not compare the predicted power amount with the demand target value Vp in the mask period Tm1 until 11:40, and 11:40. Thereafter, the predicted power amount is compared with the demand target value Vp.

  In addition, as a comparison target of the predicted power amount, for example, a cutoff alarm threshold, a caution alarm threshold, and the like may be set. The cutoff alarm threshold value and the caution alarm threshold value are determined based on the demand target value Vp. For example, the cutoff alarm threshold value is a value that is 80% of the demand target value Vp, and the caution alarm threshold value is the demand target value. It consists of 70% of Vp. In this case, when the demand control unit 131 determines that the predicted power amount exceeds the cutoff alarm threshold value or the caution alarm threshold value, the demand control unit 131 preferably causes the alarm device 7 to output an alarm sound. Since the cutoff alarm threshold value, the caution alarm threshold value, and the like are determined based on the demand target value Vp, if the demand target value Vp is the first value V1, the values are based on the first value V1.

  In this embodiment, the operation mode of the energy saving control unit 132 can be switched by a user operation between an energy saving mode in which energy saving control is performed and a release mode in which energy saving control is not performed. Therefore, regardless of the demand time limit T1 and the specified period Td1, the energy saving control unit 132 can operate in either the energy saving mode or the release mode.

(4.2) Operation at the start of the designated period Next, the operation of the power management system 1 at the start of the designated period Td1 will be described.

  As shown in FIG. 1, during the designated period Td1, the demand target value Vp is changed by the changing unit 133 so as to decrease the demand target value Vp. Here, since 12:00 to 13:00 is designated as the designated period Td1, 12:00 is the start time of the designated period Td1. Therefore, the change unit 133 changes the “demand target value” stored in the storage unit 14 from the first value V1 to the second value V2 (<when the current time reaches the start time of the designated period Td1 (that is, 12:00). Change to V1). Thereby, in the two demand time periods T1 of 12: 0 to 12:30 and 12:30 to 13:00 corresponding to the specified period Td1, the demand control unit 131 changes the demand target value Vp (= V2 after the change). ) To perform demand control.

  The operation of the power management system 1 after the change of the demand target value Vp is the same as the basic operation described above except that the demand target value Vp is different between the first value V1 and the second value V2. Note that when the demand target value Vp is changed, values determined based on the demand target value Vp (for example, a cutoff alarm threshold, a caution warning threshold, etc.) are also changed. The threshold value, the caution alarm threshold value, and the like also decrease.

  By the way, in this embodiment, the change part 133 changes the demand target value Vp so that the demand target value Vp may be further reduced, when the 2nd acquisition part 12 acquires a power saving request | requirement during designation | designated period Td1. In other words, the changing unit 133 is configured to change the demand target value Vp based on the power saving request acquired by the second acquisition unit 12 regardless of whether or not it is during the designated period Td1. Therefore, for example, after the first power saving request is issued, it is necessary to further reduce the power consumption within the designated period Td1 designated by the first power saving request, and the second power saving request is issued. In such a case, the demand target value Vp can be further reduced. In this case, the demand target value Vp is changed to a value lower than the second value V2.

(4.3) Operation at the end of the designated period Next, the operation of the power management system 1 at the end of the designated period Td1 will be described.

  As shown in FIG. 1, after the designated period Td1 ends, the return target 134 returns the demand target value Vp to the value (first value V1) before the designated period Td1 starts. Here, since 12:00 to 13:00 is designated as the designated period Td1, 13:00 is the end point of the designated period Td1. Therefore, when the current time reaches the end point of the designated period Td1 (that is, 13:00), the return unit 134 changes the “demand target value” stored in the storage unit 14 from the second value V2 to the first value V1 (> Change to V2). Thereby, in the demand time period T1 of 13: 0 to 13:30 after the end of the designated period Td1, the demand control unit 131 performs demand control using the demand target value Vp (= V1) after return. .

  The operation of the power management system 1 after the return of the demand target value Vp is the same as the basic operation described above. Note that when the demand target value Vp is changed, the values determined based on the demand target value Vp (the cutoff alarm threshold, the caution alarm threshold, etc.) are also changed. Therefore, when the specified period Td1 ends, the cutoff alarm threshold , And the warning alarm threshold and the like return to values before the designated period Td1 starts.

(4.3) Reservation Operation Next, a reservation operation of the power management system 1 using reservation information will be described.

  Since the power management system 1 according to the present embodiment can store “reservation information” in the storage unit 14, by using this “reservation information”, the demand target value Vp is changed in a reservation period that is a future designated period Td1. Is possible. That is, when the second acquisition unit 12 acquires a power saving request for a reservation period including a future designated period Td1, the storage unit 14 has information indicating the reservation period and the demand target value Vp after the change in the reservation period. And stored as reservation information.

  In the example of FIG. 1, for example, when the second acquisition unit 12 acquires a power saving request specifying a future specified period Td1 (12:00 to 13:00) at 10:00, the storage unit 14 stores Reservation information is stored. This reservation information is information indicating that the demand target value Vp is changed to the second value V2 in the designated period Td1 from 12:00 to 13:00. In this case, the changing unit 133 changes the demand target value Vp in the reservation period (12: 0 to 13:00) according to the reservation information stored in the storage unit 14. Similarly, the return unit 134 returns the demand target value Vp after the reservation period (12: 0 to 13:00) ends according to the reservation information stored in the storage unit 14.

  By such a reservation operation, even if the second acquisition unit 12 cannot receive the power saving request in real time due to, for example, a communication error of the server device 3, the change unit 133 causes the demand target value Vp in the specified period Td1. It is possible to change.

(5) Advantages As described above, the power management system 1 according to the present embodiment includes the first acquisition unit 11, the second acquisition unit 12, the demand control unit 131, and the change unit 133. The first acquisition unit 11 acquires power usage information indicating the power usage of the customer facility 100. The second acquisition unit 12 acquires, through communication, an external device 9 provided outside the customer facility 100 to request a power saving request for reducing power consumption in the specified period Td1. The demand control unit 131 controls the device 5 of the customer facility 100 based on the power usage information acquired by the first acquisition unit 11 so that the power usage amount in the predetermined demand time period T1 does not exceed the demand target value Vp. Demand control is performed. Based on the power saving request acquired by the second acquisition unit 12, the changing unit 133 changes the demand target value Vp so as to decrease the demand target value Vp during the specified period Td1.

  According to this configuration, based on the power saving request acquired by the second acquisition unit 12, the changing unit 133 is configured to reduce the demand target value Vp used for demand control in the demand control unit 131 to the designated period Td1. Thus, the demand target value Vp is changed. For this reason, the power management system 1 can achieve a reduction in power consumption even when a temporary reduction in power consumption is urgently required. Moreover, the power management system 1 realizes a demand response function in the process related to the demand control function by changing the demand target value Vp during the designated period Td1 based on the power saving request. Therefore, in the power management system 1, by using a demand control function for suppressing an increase in the maximum demand power of the customer facility 100, the power used by the customer facility 100 in the designated period Td1 can be efficiently and easily determined. Demand response function can be realized for reduction.

  Further, as in the present embodiment, the power management system 1 preferably further includes a storage unit 14. The storage unit 14 stores, as reservation information, information indicating a reservation period including a future designated period Td1 based on the power saving request acquired by the second acquisition unit 12, and the demand target value Vp after the change in the reservation period. In this case, it is preferable that the changing unit 133 is configured to change the demand target value Vp during the reservation period according to the reservation information stored in the storage unit 14. According to this configuration, for example, even if the second acquisition unit 12 cannot receive a power saving request in real time, the changing unit 133 can change the demand target value Vp in the designated period Td1. However, the storage unit 14 is not an essential configuration for the power management system 1, and the storage unit 14 may be omitted as appropriate.

  Further, as in the present embodiment, the changing unit 133 changes the demand target value Vp so as to further decrease the demand target value Vp when the second acquisition unit 12 acquires a power saving request during the designated period Td1. It is preferable that it is comprised. According to this configuration, for example, after the first power saving request is issued, when it is necessary to further reduce the power consumption within the designated period Td1 designated by the first power saving request, the demand target It is possible to further reduce power consumption by further reducing the value Vp. However, this configuration is not an essential configuration for the power management system 1, and the changing unit 133 may not change the demand target value Vp when the second acquisition unit 12 acquires a power saving request during the designated period Td1. .

(6) Modified Example The power management system 1 is not necessarily provided with the controller 2 mainly composed of a microcomputer and the server device 3 composed of a computer, and may be composed of a single device. On the contrary, the power management system 1 may be provided in a distributed manner in three or more devices. Furthermore, at least a part of the functions of the power management system 1 may be realized by, for example, cloud (cloud computing).

  Further, the information for determining the designated period Td1 may be included in the power saving request or may not be included in the power saving request. When the information for determining the designated period Td1 is not included in the power saving request, for example, the power aggregator receives the power saving request from the electric power company and includes the contents of the instructions for the plurality of customer facilities 100 including the designated period Td1. To decide. As an example, the power aggregator instructs the customer facility 100 in the district A to reduce the power consumption by 20% by setting the designated period Td1 to 12:00 to 13:00, and sets the designated period Td1 to the customer facility 100 in the district B. A reduction in power consumption of 20% is instructed as 13:00 to 14:00.

  In addition, the start time of the specified period Td1 and the end time of the specified period Td1 do not have to coincide with the break (start time or end time) of the demand time period T1. Furthermore, the specified period Td1 may be longer or shorter than the demand time period T1, or may be the same time length as the demand time period T1. That is, for example, when the demand time period T1 is set in units of 30 minutes such as 12: 00 to 12:30, 12:30 to 13:00, ..., the specified period Td1 is 12: 15 to 12:45. Or 12:10 to 12:30. In this case, even in the middle of the demand time period T1, the demand target value Vp may be changed by starting or ending the designated period Td1.

  The power management system 1 may not include the server device 3 as a component. In this case, the second acquisition unit 12 that acquires the power saving request is provided not in the server device 3 but in the controller 2. The second acquisition unit 12 in this case acquires the demand target value Vp generated (changed) by the server device 3 based on the power saving request from the server device 3. In other words, the second acquisition unit 12 does not directly acquire the power saving request, but indirectly acquires it via the server device 3. And the change part 133 changes the demand target value Vp used by demand control according to the power-saving request | requirement (demand target value Vp) which the 2nd acquisition part 12 acquired. Also in this configuration, the power management system 1 acquires the power saving request at the second acquisition unit 12 and changes the demand target value Vp based on the power saving request at the changing unit 133.

  The power management system 1 may include the measurement system 4 and a plurality of devices 5 to be controlled as constituent elements. The power management system 1 may include the external device 9 as a component.

  Further, the return unit 134 may be omitted. In this case, the power management system 1 changes the demand target value Vp in accordance with the start of the designated period Td1, but does not automatically return the demand target value Vp even when the designated period Td1 ends. Therefore, the demand target value Vp remains the second value V2 even after the designated period Td1 ends.

  Further, in demand control, the demand control unit 131 may suppress the average power consumption in the demand time limit T1 to be equal to or less than the power target value (a constant multiple of the demand target value Vp). That is, as described in the section “(1) Overview”, the average power consumption in the demand time period T1 is a value obtained by multiplying the power consumption amount in the demand time period T1 by a constant. Thus, for example, when the demand time limit T1 is 30 minutes, if the power target value is twice the demand target value Vp, the average power used in the demand time period T1 is controlled to be equal to or less than the power target value. This is equivalent to suppressing the power consumption to the demand target value Vp or less. Whether the average power consumption is less than or equal to the power target value or the power consumption amount is less than or equal to the demand target value Vp can be arbitrarily changed depending on the setting of the demand target value Vp or the power target value. Therefore, there is no technical difference between whether the average power consumption is less than the power target value or the power consumption is less than the demand target value Vp. Therefore, in demand control for controlling the device 5 so that the amount of power used in the demand time period T1 does not exceed the demand target value Vp, the device 5 is controlled so that the average power used in the demand time period T1 does not exceed the power target value. Control is also included.

  In the first embodiment, the comparison between two values such as the amount of power used and the demand target value Vp is “below” when the two values are equal and one of the two values is lower than the other. Is meant to include both. However, without being limited thereto, “below” may be synonymous with “less than” including only a case where one of the two values is lower than the other. That is, whether or not the case where the two values are equal can be arbitrarily changed depending on the setting of the threshold value or the like, so there is no technical difference between “below” or “less than”. Similarly, “above” may be synonymous with “exceed”.

(Embodiment 2)
The power management system 1 according to the present embodiment is different from the power management system 1 according to the first embodiment in the operation in the designated period Td1. Hereinafter, the same configurations as those of the first embodiment are denoted by common reference numerals, and description thereof is omitted as appropriate.

  FIG. 4 is a graph showing the operation of the power management system 1 according to the present embodiment. FIG. 4 is a graph showing the power consumption [kWh] of the customer facility 100 with the horizontal axis as the time axis. Moreover, in FIG. 4, the operation mode of the energy-saving control part 132 is described above the graph.

  In the present embodiment, the energy saving control unit 132 is configured to operate in the energy saving mode at least in the designated period Td1. That is, the operation mode of the energy saving control unit 132 is arbitrarily switched between the energy saving mode and the release mode by a user operation except for the designated period Td1, but the energy saving mode is forcibly set in the designated period Td1. Specifically, the energy saving control unit 132 forcibly operates in the energy saving mode when the current time (current time) reaches the start time of the designated period Td1 (12:00 in the example of FIG. 4). In the example of FIG. 4, since the energy saving control unit 132 operates in the release mode until 12:00, the operation mode of the energy saving control unit 132 switches from the release mode to the energy saving mode at the start of the designated period Td1. become. When the specified period Td1 ends, that is, when the current time (current time) reaches the end time of the specified period Td1, the operation mode of the energy saving control unit 132 is the operation mode before the start of the specified period Td1 (release mode in the example of FIG. 4). Return to.

  In the present embodiment, the demand control unit 131 is configured to shorten the standby time during the designated period Td1. That is, in the designated period Td1, the mask period Tm2 is shortened as shown in FIG. In FIG. 4, for comparison with the mask period Tm2, the period corresponding to the mask period other than the designated period Td1 is illustrated as “Tm1”. However, the mask period is actually “Tm2” instead of “Tm1”. It is a period to show. In the present embodiment, as an example, the standby time other than the designated period Td1 is 10 minutes, while the standby time in the designated period Td1 is set to 7 minutes. That is, in the specified period Td1, the demand control unit 131 can start demand control early by shortening the mask period Tm2 in which the predicted power amount and the demand target value Vp are not compared.

  FIG. 4 shows a graph at the time of 12:20, and the future power consumption predicted by the demand control unit 131 is indicated by a two-dot chain line. That is, in the example of FIG. 4, the first stage of control (demand control) is executed at the timing of “C1” after the end of the mask period Tm2, so that the predicted power amount becomes less than the demand target value Vp. Has been revised downward.

  When 12:00 to 13:00 is specified as the specified period Td1, the demand time period T1 from 12:30 to 13:00 is the same as the demand time period T1 from 12:00:00 to 12:30 shown in FIG. The operation mode of the energy saving control unit 132 is the energy saving mode. Also, the standby time is set short in the demand time period T1 from 12:30 to 13:00.

  In this embodiment, shortening the standby time to the limit (zero) is equivalent to the absence of the mask period Tm2. In this case, in the designated period Td1, as soon as the demand time period T1 starts, the predicted electric energy is compared with the demand target value Vp.

  As described above, the power management system 1 according to the present embodiment has a plurality of operation modes including an energy saving mode for performing energy saving control for suppressing power consumption of the device 5 and a release mode for not performing energy saving control. An energy saving control unit 132 is further provided. The energy saving control unit 132 is preferably configured to operate in the energy saving mode at least in the designated period Td1. According to this configuration, since the energy saving control unit 132 automatically operates in the energy saving mode during the designated period Td1 in which reduction of power consumption is required, the power consumption of the device 5 is suppressed, and after the change It is easy to suppress the amount of power used below the demand target value Vp (= V2). Therefore, it is easy to reduce the power used in the designated period Td1.

  Further, as in the present embodiment, the demand control unit 131 predicts the power usage at the end of the demand time period T1 based on the power usage information acquired by the first acquisition unit 11 except for the mask period Tm2. It is preferable to obtain it as an amount. The mask period Tm2 is a period from when the demand time period T1 starts until the standby time elapses. In this case, the demand control unit 131 preferably performs the demand control so that the predicted power amount does not exceed the demand target value Vp. In this case, it is preferable that the demand control unit 131 is configured to shorten the standby time during the designated period Td1. According to this configuration, the mask period Tm2 is shortened in the designated period Td1 in which reduction of power consumption is required, and demand control can be started at an early stage. Therefore, the demand target value Vp (= V2) The power consumption can be easily reduced below. Therefore, it is easy to reduce the power used in the designated period Td1.

  However, the power management system 1 according to the present embodiment applies both the configuration in which the energy saving control unit 132 operates in the energy saving mode in the designated period Td1 and the configuration in which the standby time is shortened in the designated period Td1. Is not essential, and only one of them may be applied. That is, in the power management system according to the present embodiment, the energy saving control unit 132 may operate in the release mode during the designated period Td1, or the standby time may not be shortened during the designated period Td1.

  The configuration described in Embodiment 2 can be applied in appropriate combination with the various configurations (including modifications) described in Embodiment 1.

DESCRIPTION OF SYMBOLS 1 Power management system 5,51,52,53, ... 5n Apparatus 11 1st acquisition part 12 2nd acquisition part 100 Consumer facility 131 Demand control part 132 Energy saving control part 133 Change part 14 Storage part T1 Demand time limit Td1 Designation period Tm1 , Tm2 Mask period Vp Demand target value

Claims (5)

A first acquisition unit that acquires power consumption information representing the power consumption of a customer facility;
A second acquisition unit that acquires, by communication, an external device provided outside the customer facility, to request a power saving request to reduce power consumption during a specified period;
Demand control for performing demand control for controlling the equipment of the customer facility based on the power usage information acquired by the first acquisition unit so that the power usage amount in a predetermined demand time period does not exceed the demand target value And
A power management system comprising: a change unit that changes the demand target value so as to decrease the demand target value during the designated period based on the power saving request acquired by the second acquisition unit. The storage unit further stores, as reservation information, a reservation period including the designated period in the future based on the power saving request acquired by the second acquisition unit and information indicating the demand target value after the change in the reservation period. ,
The power management system according to claim 1, wherein the change unit is configured to change the demand target value during the reservation period according to the reservation information stored in the storage unit. An energy saving control unit having a plurality of operation modes including an energy saving mode for performing energy saving control for suppressing power consumption of the device and a release mode not performing the energy saving control;
The power management system according to claim 1, wherein the energy saving control unit is configured to operate in the energy saving mode at least during the specified period. The demand controller is
Except for the mask period from the start time of the demand time period until the standby time elapses, the power consumption at the end time of the demand time period is predicted power based on the power usage information acquired by the first acquisition unit The demand control is performed so that the predicted power amount does not exceed the demand target value.
The power management system according to any one of claims 1 to 3, wherein the waiting time is configured to be shortened during the designated period. The change target unit is configured to change the demand target value so as to further reduce the demand target value when the second acquisition unit acquires the power saving request during the specified period. The power management system according to any one of -4.

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